"We used to count that the Messenger of Allah ﷺ said one hundred times in a gathering: 'Rabbighfirli wa tub ʿalayya innaka Antat-Tawwabur-Rahim (O Allah forgive me and accept my repentance, for You are the Accepter of repentance, the Most Merciful).'"
إِنْ كُنَّا لَنَعُدُّ لِرَسُولِ اللَّهِ ﷺ فِي الْمَجْلِسِ يَقُولُ رَبِّ اغْفِرْ لِي وَتُبْ عَلَىَّ إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ مِائَةَ مَرَّةٍ